| Reinforced concrete structure is one kind of structural style which is used extremely widespread, and the durability study is a significant project in the research of RC structure. Based on the predecessors'research, the effect of structural micro-crack defect to the Cl- permeation of concrete are analyzed through the experimental analysis and numerical simulation. On the previous foundations, fuzzy timevariant reliability model for the concrete structure Cl- permeation durability is established by the application of fuzzy theory and membership function.The concrete specimens are split from the four different dimensions in the splitting experiment in order to build the even damage fields. The displacements of the concrete specimens'surface are analyzed through DSCM(Digital Speckle Correlation Method). Further more, ANSYS numerical simulation for the concrete splitting process is established which can verify the experimental results each other. Therefore damage parameters are determined that are damage area based on the MCOD(Micro-Crack Opening Displacement) and damage variable based on the weighting-damping elastic modulus. At the same time, Cl- permeation of concrete specimens before and after the splitting test are all studied by NEL method, and diffusion coefficients of Cl- are recorded in detail. Further relationships between the damage parameters and diffusion coefficients of Cl- are discussed. The effects of structural micro-crack defect to predection life of concrete structure in the Cl- environment are discussed through the material degradation effective coefficient K. Finally fuzzy timevariant reliability model for the concrete structure Cl- permeation durability is established by the application of fuzzy theory and attenuation function, which is effective through the example confirmation. Therefore the new durability evaluation method for the in-service concrete structure in the Cl- environment is discussed. |
PDF Full Text Request